NEETPhysicsRotational Motion
Match List-I with List-II List-I List-II (A) Moment of inertia of solid sphere of radius R about any tangent. (I) 5 3 MR 2 (B) Moment of inertia of hollow sphere of radius R about any tangent. (II) 7 5 MR 2 (C) Moment of inertia of circular ring of radius R about its diameter. (III) 1 4 MR 2 (D) Moment of inertia of circular disc of radius R about any diameter. (IV) 1 2 MR 2
Options
- AA - II , B - I , C - IV , D - III
- BA - I , B - II , C - IV , D - III
- CA - II , B - I , C - III , D - IV
- DA - I , B - II , C - III , D - IV
Correct answer
A. A - II , B - I , C - IV , D - III
Step-by-step solution
For solid sphere I 0 = I com + M R 2 (Using parallel axis theorem) I 0 = 2 5 M R 2 + M R 2 I 0 = 7 5 M R 2 ⇒ A → I I For hollow sphere I = I com + M R 2 ⇒ I = 5 3 M R 2 ⇒ B → I For Circular ring I 1 + I 2 = I 3 ( Using perpendicular axis theorem) By symmetry MOI About 1 and 2 Axis are same i.e. I 1 = I 2 ∴ 2 I 1 = I 3 = M R 2 ∵ I c o m = M R 2 I 1 = M R 2 2 ⇒ C → I V Similarly in disc 2 I 1 = M R 2 2 ∵ I com = M R 2 2 I 1 = M R 2 4 ⇒ D → I I I